1) The densities of the waters from Lake Takasukanuma were determined directly by means of SPRENGEL'S pycnometer.
2) The results were compared with those which had been calculated from the temperatures of the waters and from the temperature-density curve of pure water.
3) A decrease of density was noticed in the deepest waters. Discussions were made on its cause and on its role which is played for returning the chemical constituents of lake-deposits towards the main body of lake-water.
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